Triggering degradation of cellulose acetate by embedded enzymes: Accelerated enzymatic degradation and biodegradation under simulated composting conditions

This article investigates a novel approach to improving the degradability of cellulose acetate by embedding immobilized lipase enzymes directly within the material. Recognizing that deacetylation is the key step limiting cellulose acetate biodegradation, the authors developed cellulose acetate films containing enzyme-loaded cellulose acetate particles and studied their behavior during enzymatic aging, simulated composting, and exposure to water.

The work explores how embedded enzymes influence deacetylation, molecular weight reduction, surface properties, and overall degradation performance while maintaining the bio-based nature of the material.

The study found that embedded enzymes significantly accelerated the degradation of cellulose acetate by promoting deacetylation from within the material. Compared with conventional cellulose acetate films, enzyme-containing films exhibited much greater reductions in molecular weight, increased hydrophilicity, faster structural breakdown, and substantially enhanced degradation under simulated composting conditions. After prolonged composting, films with the highest enzyme content had almost completely disappeared, while large fragments of conventional cellulose acetate remained. These findings demonstrate a promising strategy for designing cellulose acetate products that retain performance during use but degrade more readily at end of life, offering valuable insights for sustainable materials development, waste management, and future innovation in biodegradable cellulose-based plastics.

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